On 01/19/2011 08:42 AM, Justin Ruggles wrote:
> On 01/18/2011 08:58 PM, John Stebbins wrote:
>
>> I am attempting to update some code to work with the new float
>> implementation of the ac3 encoder. I made what I believe
>> are the necessary changes, but the audio produced is just a buzz. mplayer
>> generates these errors:
>>
>> [ac3 @ 0xd86060]exponent out-of-range
>> [ac3 @ 0xd86060]error decoding the audio block
>> [ac3 @ 0xd86060]delta bit allocation strategy reserved
>> [ac3 @ 0xd86060]error decoding the audio block
>> [ac3 @ 0xd86060]delta bit allocation strategy reserved
>> [ac3 @ 0xd86060]error decoding the audio block
>> [ac3 @ 0xd86060]delta bit allocation strategy reserved
>> ...
>>
>> I have generated a minimal test program to demonstrate the problem I am
>> having. This program works with the fixed point
>> implementation from ffmpeg r25689, but does not work with current git head.
>> There is a define to change from fixed to
>> float mode at the top of the code so I can switch easily between. The
>> program takes as input a raw stereo pcm 48khz
>> file and outputs a raw ac3 file.
>>
>> Could someone knowledgeable take a look and see if there is anything obvious
>> I am doing incorrectly?
>
> The floating-point sample format is in the range -1.0 to 1.0. You need
> to scale the samples when you're converting from int16.
>
Thankyou much.
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